Wavecom WISMO Quik Q2406 - Figure 24: RTC Supplied by a Battery Cell with Regulator; Figure 25: RTC Supplied by a Non Rechargeable Battery

WM_PRJ_Q2400_PTS_005 -007
18th January 2006
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2.10.2.3 Battery cell with regulator
Regulator
2.5 V
±
10%
(With very Low Iq)
+VBATT
2 K
1K
En
Vout
Gnd
Vin
Shottky
Diode
VCC_RTC
Figure 24: RTC supplied by a battery cell with regulator
Estimated range with 2 mAh rechargeable battery: ~3 days.
Warning:
Before battery cell assembly insure that cell voltage is lower than 2.75V to
avoid any damage to the WISMO module.
2.10.2.4 Non Rechargeable battery
This is the less recommended solution.
VCC_RTC
(2.75 V max)
Diode (Ex: BAS16)
10
Ex: CR2016
(VARTA)
Figure 25: RTC supplied by a non rechargeable battery
Estimated range with 85 mAh battery: 4000 h minimum.
Note: The “non rechargeable battery” is always active, except when the module
is ON.